Wednesday, 15 February 2012

Polycarbonate vs PET

If you read articles from manufacturers of polycarbonate and PET, the claims made for applications in bottle-making seem at odds. Data are produced to prove that PET or polycarbonate (depending on the origin of the article) is far superior for the production of 19 litre bottles. I have distilled information from several sources to try and provide a balanced picture.

In early history, water was stored in animal skins and large clay pots.  Although storage was temporary and the water was not always pure and sanitary, the containers served a need.  In more modern times water was bottled in glass containers, which were sanitary as well as clear, allowing consumers to see the contents.  However, they were also heavy and breakable.  As in all evolutionary trends, the industry began to look for a packaging material that would perform better than glass.

The search led to polycarbonate. Bottles made from polycarbonate were more durable than glass yet lighter.  Performance outweighed cost, hence the industry invested in new equipment and made the switch to polycarbonate.  Further searches for less expensive materials led to the use of PET, which transformed the convenience single-trip water market.  However, what about 19 litre, multiple-trip containers?

An important aspect is that the moulding techniques are completely different. This allows polycarbonate to have greater design flexibility such as integral moulded handles. PET bottles need a separately moulded solid handle (as shown).

However, PET has a better finish with smooth internal neck and no die lines or need for trimming. On the other hand, PET has a tendency to shrink at high wash temperatures which can cause leakage problems eventually.  PET is more flexible than polycarbonate and can often stand more impact punishment. The plastic distribution is better in PET bottles and the stress tendency is not dependent on manufacturing procedures such as annealing.

PET polymers provide a better barrier to gases when compared to polycarbonate and less tendency to allow odour elements through the bottle wall.  Polycarbonate has better scratch resistance and can be washed at temperatures between 60-70 degrees C without problems. You should obtain more return trips with polycarbonate compared with PET.  The cost of PET resin is less than polycarbonate, but the cost of equipment to make PET bottles is higher.  Polycarbonate can be recycled by grinding to make more bottles whereas PET does not retain the same degree of its original properties.

Other comparisons are possible, but hopefully this has provided you with some insight into the ongoing debate.


  1. Thank you for sharing valuable information. Nice post. I enjoyed reading this post. The whole blog is very nice found some good stuff and good information here Thanks..Also visit my page shade cloth If you have any questions or if you need additional assistance, please feel free to contact us at anytime!

  2. I’m glad read to this blog.Very attractive and helpful info.

    Polycarbonate Profiles

  3. Nice thoughts, I love this article.

    Impact Hygiene Services

  4. Polycarbonate panels are available in clear glass-like shades and also opaque shades for better cover and also can withstand impacts from footballs, hailstone and even rocks.
    Polycarbonate Roofing Materials

  5. This one is interesting and those with pets must take special care about all these things. Those who are having pets can also take help from the Pet Grooming Tips to groom your pets well.

  6. A good polycarbonate sheets would still remain in one piece even after being exposed to heavy downpours. Polycarbonate Sheet

  7. This information really worth saying, i think you are master of the content and thank you so much sharing that valuable information and get new skills after refer that post.
    Poly Carbonate Roofing in Chennai

  8. Nice post! Polycarbonate sheet is best for light transmission and possess fire resistant properties and many more.

    Polycarbonate Roofing Sheets | Polycarbonate Sheet

  9. Thanks for sharing the ideas.For building green houses Polycarbonate Sheets are preferred mostly. The color wont fade easily. The panels will be less weighted so it can be easily shifted.

  10. The only word that I can use here is complete. I am delighted to receive well defined information all under one roof. Now I am ready to book greenhouse or my choice and will not make any sort of delay as well. Plus I also request others to have a loom too.

    Drivhus | Drivhus Til Salgs | Terrasse Tak | Polykarbonat | Polykarbonat Platter | Kanalplast | Drivhus Plast | Drivhus I Tre | PVC Gardin

  11. I'm  here to share my testimony of what a good trusted loan company did for me. My name is Nikita Tanya, from Russian and I’m a lovely mother of 3 kids I lost my funds on trying to get a loan it was so hard for me and my children, I went online to seek for a loan assistance  all hope was lost until one faithful day when I met this friend of mine who recently secured a loan from Le_Meridian Funding Service She introduced me to this honest loan company who helped me get a loan in within 5 working days, I will forever be grateful to Mr Benjamin, for helping me get back on feet again. You can contact Mr Benjamin via email:, they do not know I’m doing this for them, but i just have to do it because a lot of people are out there who are in need of a loan assistance  please come to this company and be saved.WhatsApp:(+1 989-394-3740)

  12. Some articles said that Polycarbonate is suitable for food containers which reusable such as 5gallon barrel, PET is allowing only for single use such as any regular bottles because PET can generate bisphenol.
    Can someone reply? I'm correct or not.

    1. As per latest research PC is generating bps after no of recycling , where as PET is safer, water industry is slowly moving to PET